The Lansky Deluxe Diamond Knife Sharpening System ensures that your knife edge sharpens to the exact bevel you specify. Designed to give your blade a professional, razor sharp edge every time, regardless of your sharpening ability. Excellent for beginners and advanced users alike. The original and legendary Controlled-Angle System is the ultimate in Knife Sharpening technology. FeaturesSharpen your knife to 17, 20, 25, and 30 degree anglesSoft bristled nylon brush for cleaning Guide rods for every hone